diff --git a/src/inputHandling.c b/src/inputHandling.c
index b147ae1..3d1ff4a 100644
--- a/src/inputHandling.c
+++ b/src/inputHandling.c
@@ -5,17 +5,17 @@
 
 
 char data[1000];
-void deleteWhitespace(char* a, int length);
-op readFunction(char* data, int length);
-char* getNumbers(char* data, int length, calc_op* structure_ref);
-void showStruct(calc_op* formula);
+void deleteWhitespace(char* formulaString, int length);
+op readFunction(char* formulaString, int length);
+char* getNumbers(char* formulaString, int length, calc_op* formulaRef);
+void showStruct(calc_op* formulaRef);
 
 
-void input(char* a, int length) {
-    deleteWhitespace(a, length);
+void input(char* formulaString, int length) {
+    deleteWhitespace(formulaString, length);
     calc_op temp;
-    memcpy(data,a,length);
-    temp.formel = a;
+    memcpy(data, formulaString, length);
+    temp.formel = formulaString;
     temp.funktionstyp = readFunction(data, 10);
     if (getNumbers(data, length, &temp) == NULL){
         showStruct(&temp);
@@ -25,20 +25,20 @@ void input(char* a, int length) {
 }
 
 //Leerzeichen löschen
-void deleteWhitespace(char* a, int length){
+void deleteWhitespace(char* formulaString, int length){
     for(int i=0; i<length; i++){
-        if((a[i]==' ')||(a[i]=='\n')||(a[i]=='\r')){
+        if((formulaString[i] == ' ') || (formulaString[i] == '\n') || (formulaString[i] == '\r')){
             for (int j=i; j<length; j++){
-           a[j]=a[j+1];
+                formulaString[j]=formulaString[j + 1];
             }
         }
     }
 }
 
 //Einfachste Rechenoperationen lesen
-op readFunction(char* data, int length){
+op readFunction(char* formulaString, int length){
     for(int i=0; i<length; i++){
-        switch (data[i]){
+        switch (formulaString[i]){
             case '+': return opAdd;
             case '-': return opSub;
             case '/': return opDiv;
@@ -51,12 +51,12 @@ op readFunction(char* data, int length){
 }
 
 //Zahlen auslesen (+)
-char* getNumbers(char* data, int length, calc_op* structure_ref){ //input sind: string, länge vom String, berechnungsstruct
+char* getNumbers(char* formulaString, int length, calc_op* formulaRef){ //input sind: string, länge vom String, berechnungsstruct
     // char tmp[length];
     char* splitPnt;
     int i = 0;
     char delimiter;
-    switch (structure_ref->funktionstyp) {
+    switch (formulaRef->funktionstyp) {
         case opAdd:
             delimiter = '+';
             break;
@@ -71,15 +71,15 @@ char* getNumbers(char* data, int length, calc_op* structure_ref){ //input sind:
             break;
         default: return NULL;
     }
-    // memcpy(tmp, data, length);     //string kopiert
-    char *token = strtok(data, &delimiter); //An der Stelle von dem ersten Plus wird ein NULL (Stringende) gesetzt
+    // memcpy(tmp, formulaString, length);     //string kopiert
+    char *token = strtok(formulaString, &delimiter); //An der Stelle von dem ersten Plus wird ein NULL (Stringende) gesetzt
     while (token != NULL) {
-        structure_ref->array[i] = atof(token);  // String zu double konvertiert
+        formulaRef->array[i] = atof(token);  // String zu double konvertiert
         i++;
         splitPnt = token;
         token = strtok(NULL, "+"); //Sucht von der letzten Plus-Stelle an weiter
     }
-    structure_ref->arraylength=i; //Länge des Arrays (also zu berechnende Zahlen) gespeichert
+    formulaRef->arraylength=i; //Länge des Arrays (also zu berechnende Zahlen) gespeichert
     op type = readFunction(splitPnt, strlen(splitPnt)+1);
     if (type != opNotSupported && type != opEmpty){
         return splitPnt;
@@ -88,9 +88,9 @@ char* getNumbers(char* data, int length, calc_op* structure_ref){ //input sind:
     }
 }
 
-void showStruct(calc_op* formula){
-    printf("Berechnung: %s\n", formula->formel);
-    switch (formula->funktionstyp) {
+void showStruct(calc_op* formulaRef){
+    printf("Berechnung: %s\n", formulaRef->formel);
+    switch (formulaRef->funktionstyp) {
         case opAdd:
             printf("Rechenoperation: Addition\n"); break;
         case opSub:
@@ -103,8 +103,8 @@ void showStruct(calc_op* formula){
             printf("Fehler bei Auswahl der Rechenoperationen \n");
     }
     printf("Calculation Variables:\n");
-    for (int i = 0; i < formula->arraylength; ++i) {
-        printf("Array[%i] = %f\n", i, formula->array[i]);
+    for (int i = 0; i < formulaRef->arraylength; ++i) {
+        printf("Array[%i] = %f\n", i, formulaRef->array[i]);
     }
-    printf("Result: %f", formula->result);
+    printf("Result: %f", formulaRef->result);
 }
\ No newline at end of file
diff --git a/src/inputHandling.h b/src/inputHandling.h
index 9d91f38..337096e 100644
--- a/src/inputHandling.h
+++ b/src/inputHandling.h
@@ -15,7 +15,7 @@ void* parent;
 double result;
 }calc_op;
 
-extern void input(char* a, int length);
-extern void showStruct(calc_op* formula);
+extern void input(char* formulaString, int length);
+extern void showStruct(calc_op* formulaRef);
 
 #endif // INPUTHANDLING_H